Padlock



(No Model.)

J. B. PRICE.

PADLOGK.

\ No. 483,866. Patented. out. 4, 1892.

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UNITED STATES PATENT OFFICE.

JOHN B. PRICE, OF VVOLLASTON, MASSACHUSETTS.

PAD LOCK.

SPECIFICATION forming part of Letters Application filed March 30, 1892.

T at whom it may concern.-

Be it known that I, JOHN B. PRICE, a citizen of the United States,residing at Wollaston, in the county of Norfolk and State ofMassachusetts,have invented certain new and usefullmprovements inPadlocks; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to improvements in padlocks having acircularly-moving annular bolt which is divided to adapt one end of thebolt to enter a hook or staple.

One of the objects of my invention is to provide greater security forthe lock against surreptitious opening of the same by a pick orimplement other than the proper key, and, further, to arrange andcombine the parts in a compact simple form.

With these ends in View the invention consists of a suitable casing, anannular divided bolt normally pressed or held by a spring in positionacross the hasp or staple receiving, opening of the lock-casin g, apivoted hub having an arm connected to the bolt to shift the same andanother arm arranged in the path of a key and adapted to be operated bythe same when the tumblers are'disengaged from the same by the wards ofthe key, said tumblers being pivoted to engage with the pivoted hub whenthe bolt is projected and each having a spur or hook which is adapted tobe engaged with the annular divided bolt should the tumbler (one or more01" the same) be moved by a pick or other implement to a position beyondthe one which it assumes when operated by the key.

The invention further consists in the peculiar construction andarrangement of parts, which will be hereinafter more fully described,and pointed out in the claims.

In the accompanying drawings, Figure 1 is a face view of the lock withone of the plates or covers removed, showing the normal position of theannular divided bolt. Fig. 2 is a similar view with the parts inposition when the annular bolt is retract-ed. Fig. 3 is a sectional viewon the line as x of Fig. 1. Fig. 4 is a detail view of the pivotedoperating-hub. Fig. 5 is a detail view of one of the tumblers, and Fig.6 is a similar view of the bolt.

Patent No. 483,866, dated October 4, 1892.

Serial No. 427,109. (No model.)

Like letters of reference denote corresponding parts in the severalfigures of the drawings.

A is the lock-casing, which is made, preferably, circular in outline,and in its lower side the casing has a key-opening a,-while in theopposite upper side a hasp or staple receiving slot or. is formed, whichextends radially from the perimeter of the casing for a suitabledistance into the same to adaptthe hasp or staple to properly fit intothe lockcasing, so that the bolt can suitably engage therewith. Withinthe locking-casing and rigid with one part thereof is a pillar-plate B,which is of less diameter than the casing itself and is arrangedconcentric with the same, so that an annular groove or way I) isprovided between the opposing faces of the pillar-plate and thelockcasing, and in this annular groove is fitted an annular circularlymoving bolt 0, which is adapted to move freely in said groove or wayaround the pillar-plate as a center. The bolt is divided at c to form anopening therein, and the two ends (1 d, one of which d is adapted to beprojected across the hasp or staple opening a, and in the path of theother end d of the bolt is projected an abutment 6, which lies in thegroove or way 1) and is rigid with the pillar-plate or the lock-casing,as most preferred. The radial slot at for the hasp or bolt also extendsinto the pillar-plate for a suitable distance, as shown. One face of thepillar-plate is recessed or cut away to provide a space or chamber forthe tumblers and the key-operated hub.

The hub D is pivoted at d to the pillarplate, so that the pivot lies outof the path of the key when it is thrust into the lock between the guide6' and the tumblers, and rigid with the hub is a tongue D, which isprojected into the path of the key, so that the end thereof can engagewith the tongue at one side of the pivot of the operating-hub after saidkey has operated the tumblers to free them from engagement with thetongue. The lower face of the-tongue is hollowed out or curved toprovide a seat for the end of the key, and the upper side of the tongueisbeveled or inclined to form a sharp edge, over which take the ends ofthe tumblers E. A suitable number of these tumblers are employed, beinglaid flat one upon the other and pivoted to a common pivot e ,-which isfastoned in the pillar-plate, and each tumbler has two hooksor spurs f fone of which hooks f is forced over the tongue D by the tumblerspring Fwhen the bolt is projected, and the other hook f is adapted to be forcedinto a recess or notch f in the. inner edge of the bolt should thetumbler be moved by a pick or other implement beyond the position towhich it is moved by the proper ward of the key, whereby the hooks f onthe tumblers are adapted to engage with the bolt and prevent itsretraction when an attempt is made to open the look by any implementother than the proper key. The key-operated hub is further provided witharadial arm g, which extends to the bolt and fits in a socket 9, formedtherein for its reception, and when the hub is turned by the inward pushof the key this arm g serves to retract the bolt against the tension ofthe projecting spring B. This spring is preferably of the coiled patternand is fitted in the space between the abutment e and the shoulder orend (1' of the bolt,the tension of the spring being sufficient to throwor project the bolt across the slot a 1 when the key is withdrawn.

This being the construction of my improved padlock, the operation may bedescribed as follows: Normally the spring H impels the end 61 of thebolt across the slot at, and the tumbler-springs cause the tumblers totake over the tongue of the operating-hub, thus locking the bolt in itsprojected position. When the proper key is inserted, the wards act onthe parts E of the tumblers and force the same rearward to disengage thehooks f from the tongue, thus releasing the hub from theoperating-piece, and the continued inward movement of the key causestheend thereof to move the tongue D upward, thereby turning the hub on itspivot and throwingthe arm g to retract the bolt against the tension ofthe spring H. The lock can now be detached,

and when it is desired to again fasten the.

door it is only necessary to insert the staple or hasp into the slot atand withdraw the key,

whereupon'the spring H instantly projects the bolt and the tumblers areforced into engagement with the tongue D, locking the bolt againstretrograde movement. If a pick or implement is inserted in the lock toopen the same, one or more of the tumblers are forced backward farenough to bring the hook or hooks f into the notch f and thereby holdthe bolt from being retracted.

I am aware that changes and alterations can be made without departingfrom the spirit or sacrificing the advantages of my invention, and Itherefore reserve the right to make such modifications and alterationsas fairly fall within the-scope of my invention.

What I claim as new is- 1. In a padlock, the combination, with theslotted casing, of an annular divided bolt guided within said casing tohave circular movement therein, a pivoted key-operated hub connected tothe bolt, and a tongue arranged in the path of a key, and the tumblersE, pivoted within the casing and having the hooks f, which take over thetongue of the key-operated piece, said tumblers having projectionsbetween their pivots 'and' the hooks f, which are adapted to be operatedby a key to force the tumblers away from the key-operated piece, as andfor the purpose described.

2. In a padlock, the combination, with a suitable casing, of a dividedannular bolt guided within the casing to have circular movement therein,a pivoted operating-piece having an arm connected to said bolt and atongue arranged in the key-path, and the tumblers engaging with saidtongue of the operating-piece, substantially as described.

3. In a padlock, the combination of a suitable casing, an annulardivided bolt having the notch f the key-operated piece connected withthe bolt and having a tongue, and the pivoted tumblers. each having twohooks or projections, one projection being normally in engagement withsaid tongue and the other projection adapted to engage with the notch inthe bolt, for the purpose described, substantially as set forth.

7 4. Ina padlock, the combination of a cas- IOO

